<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div
                        class="button-wrapper"
                        v-for="(item,index) in hot"
                        :key="index"
                        @click="handleCityClick(item.name)"
                        >
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) in cities" :key="key" :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div
                        class="item border-bottom"
                        v-for="(innerItem,index) in item"
                        :key="index"
                        @click="handleCityClick(innerItem.name)"
                        >
                        {{innerItem.name}}
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">B</div>
                <div class="item-list">
                    <div class="item border-bottom">阿拉尔</div>
                    <div class="item border-bottom">阿拉尔</div>
                    <div class="item border-bottom">阿拉尔</div>
                    <div class="item border-bottom">阿拉尔</div>
                    <div class="item border-bottom">阿拉尔</div>
                    <div class="item border-bottom">阿拉尔</div>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
    import Bscroll from 'better-scroll'
    import {mapState,mapMutations} from 'vuex'
    export default {
        name: 'cityList',
        computed:{
                ...mapState({
                    currentCity:'city'
                })
        },
        props:{
           hot:Array,
           cities:Object,
           letter:String
        },
        methods:{
            handleCityClick(city){
               /*this.$store.commit('changeCity',city);*/
               this.changeCity(city);
               this.$router.push('/');
            },
            ...mapMutations(['changeCity'])
        },
        mounted(){
          this.scroll=new Bscroll(this.$refs.wrapper);
        },
        watch:{
          //监听器  监听letter的变化
          letter(){
              if(this.letter){
                 //this.$refs[this.letter]是数组  scrollToElement方法的参数必须是dom元素 所以在后面加上[0]
                  const element = this.$refs[this.letter][0];
                  //当letter不为空的时候  scrollToElement回自动滚到与this.letter相对应的区峪
                  this.scroll.scrollToElement(element);
              }
          }
        }
    }
</script>
<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
    .border-topbottom
      &:before
        border-color:#ccc
      &:after
        border-color:#ccc
    .border-bottom
      &:before
        border-color:#ccc
    .list
      overflow:hidden
      position:absolute
      top:1.58rem
      left:0
      right:0
      bottom:0
      .title
        line-height:.54rem
        background:#eee
        padding-left:.2rem
        color:#666
        font-size:.26rem
      .button-list
        overflow:hidden
        padding:.1rem .6rem .1rem .1rem
        .button-wrapper
          width:33.33%
          float:left
          .button
            text-align:center
            margin:.1rem
            border:.02rem solid #ccc
            padding:.1rem 0
            border-radius:.06rem
      .item-list
        .item
          line-height:.76rem
          padding-left:.2rem
</style>